Petroleum Reservoir Evaluation and Development >

2020 , Vol. 10 >Issue 4: 59 - 62

DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2020.04.009

Engineering Process

Application of double string screen completion in horizontal wells of Qinshui CBM Block

  • Baoan XIAN ,
  • Li WANG ,
  • Xiaobin ZHANG ,
  • Yansen BI ,
  • Zhou ZHANG
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  • 1. Institute of Resources & Environment, Henan Polytechnic University, Jiaozuo, Henan 454000, China
    2. Collaborative Innovation Center of Coalbed Methane and Shale Gas in Central China Economic District, Jiaozuo, Henan 454000, China
    3. Henan International Joint Laboratory for Unconventional Energy Geology and Development, Henan Polytechnic University, Jiaozuo, Henan 454000, China
    4. China United Coalbed Methane Co., Ltd, Beijing 100080, China
    5. Beijing Jiuzun Energy Technology Co., Ltd., Beijing 100085, China
    6. China Petroleum University（Beijing）, Beijing 102249, China

Received date: 2020-03-21

  Online published: 2020-08-07

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Abstract

The damage of coal-rock reservoir completion fluid and the easy collapse of horizontal wells are the main factors limiting the output of coalbed methane horizontal wells in Qinshui area. In terms of the resulting problems of low horizontal well production and production reduction, the integrated technology of dual-tubing screen completion and production increasing is used to solve the problems of damage to coal seam caused by completion fluid of horizontal wells of coalbed methane and the instability of open hole wall of coal seam. Therefore, one-trip drilling of completion and flushing operation is realized, the output of single CBM well is improved, and the stable production cycle of a CBM well is extended. The dual tubing completion structure of a horizontal CBM well consists of an outer screen system and an inner flushing system. The outer screen system can realize the long time support of the shaft wall and prevent the collapse, while the inner flushing system can establish the completion fluid circulation channel, realize the function of hydraulic jet, pollution prevention, sand flushing and well cleaning, reduce the resistance encountered of screen pipe entering, and improve the success rate of screen pipe entering in just one-time. This process is the main method to develop horizontal wells in Qinshui CBM Block. A series of screen pipes and supporting tools with an outer diameter of 73 mm, 89 mm and 110 mm have been developed, and this technology has been popularized and applied in 331 horizontal CBM wells. Compared with the open-hole horizontal wells developed in the year before 2014, the stable production cycle of the screen completion horizontal wells is increased by more than 5 times, and the single well production of the horizontal wells of 15# coal seam has exceeded 1 000 m 3 to the fundamentally solve technical difficulties in development. A new efficient development mode suitable for the horizontal wells in the refreshing water coalbed methane block is formed.

Key words： coalbed methane; horizontal well; dual tubing; screen completion; increase production

Cite this article

Baoan XIAN , Li WANG , Xiaobin ZHANG , Yansen BI , Zhou ZHANG . Application of double string screen completion in horizontal wells of Qinshui CBM Block[J]. Petroleum Reservoir Evaluation and Development, 2020 , 10(4) : 59 -62 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.04.009

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